Bring back setup.py for universal wheels

setup.py

@@ -0,0 +1,48 @@
+# Copyright 2019 Ram Rachum and collaborators.
+# This program is distributed under the MIT license.
+import setuptools
+import re
+
+
+def read_file(filename):
+    with open(filename) as file:
+        return file.read()
+
+version = re.search("__version__ = '([0-9.]*)'",
+                    read_file('pysnooper/__init__.py')).group(1)
+
+setuptools.setup(
+    name='PySnooper',
+    version=version,
+    author='Ram Rachum',
+    author_email='ram@rachum.com',
+    description="A poor man's debugger for Python.",
+    long_description=read_file('README.md'),
+    long_description_content_type='text/markdown',
+    url='https://github.com/cool-RR/PySnooper',
+    packages=setuptools.find_packages(exclude=['tests*']),
+    install_requires=read_file('requirements.in'),
+    extras_require={
+        'tests': {
+            'pytest',
+        },
+    },
+    classifiers=[
+        'Environment :: Console',
+        'Intended Audience :: Developers',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: Implementation :: CPython',
+        'Programming Language :: Python :: Implementation :: PyPy',
+        'License :: OSI Approved :: MIT License',
+        'Operating System :: OS Independent',
+        'Topic :: Software Development :: Debuggers',
+    ],
+)